Are you too far in to change to a 3.5" pipe? Going from two 2.5" pipes to a single 3" is a substantial reduction in flow. You're going to choke the car. Take a look at the first post below. The author's included a chart with all of the math.
Exhaust Tube Sizing: I did your Arithmetic for you!! - Exhaust - HybridZ
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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